Handheld blower

ABSTRACT

A handheld blower includes a housing having an air inlet and a duct assembly mounted in front of the air inlet, the duct assembly including a duct connected with the housing, a motor and a fan mounted in the duct, a battery, and a blowpipe connected to the housing by the duct assembly, the blowpipe defining a central axis in the length direction, and a handle arranged above the housing and the battery. The handle includes a gripping portion arranged on opposite sides of a plane in which the gravity center of the blower is located, and the plane is parallel to a central axis of the blowpipe and substantially perpendicular to a working ground. The gravity center of the handheld blower is adjacent to the gripping portion which enhances the handling comfort and reduces operator fatigue during long times of operation.

RELATED APPLICATION INFORMATION

This application claims the benefit of and is a continuation of U.S.application Ser. No. 15/427,673, filed on Feb. 8, 2017, whichapplication claims the benefit of and is a continuation of U.S.application Ser. No. 14/034,064, filed on Sep. 23, 2013, whichapplication claims the benefit of CN 201310054133.2, filed on Feb. 20,2013, CN 201310110462.4, filed on Mar. 29, 2013, CN 201310107859.8,filed on Mar. 29, 2013, and CN 201310110140.X, filed on Mar. 29, 2013,the disclosures of which are all incorporated herein by reference intheir entirety.

FIELD OF THE SUBJECT DISCLOSURE

The subject disclosure relates to electrical garden tools and, moreparticularly, to a handheld blower.

BACKGROUND

A garden handheld blower is mainly powered in two manners, namely, by anexternal power supply or a battery pack. If the external power supply isused, the machine can only be used in applications with a powerinterface which greatly limits the application scope of the handheldblower. While the use of a battery pack can solve this problem, in thecase of the battery pack, the weight and the size of the battery pack isgenerally large in order to ensure endurance of the device. As thecapacity of the battery pack is increased, the whole weight of thehandheld blower is also increased accordingly, and then the comfort ofhandling is decreased gradually. Moreover, the arrangements for themembers of most handheld blowers are unreasonable, which causesinflexible operation, and the operator needs to additionally provide aforce to overcome the deflection of the handheld blower during operationwhich may cause hand pain after a long time of operation.

As for some garden handheld blowers, since the air needs to pass throughthe motor, the conducting wires of the motor may be fixed by twomanners. In one manner, the wires are exposed in the airflow directly,thus it has a weak reliability, and the air trends to tear out the wiresduring a high-speed operation, so that the motor cannot be switched on.In the other manner, a fixation tool for installing the wires isarranged in the duct, which can facilitate the fixing and protection ofthe wires. But, due to the added members, on one hand, the cost isincreased and, on the other hand, the air resistance is also increasedand the blowing efficiency of the whole machine is reduced.

The garden handheld blowers are mainly used to blow fallen leaves andsmall garbage on the ground. In order to blow plenty of fallen leaves onthe ground and some relatively heavy garbage, the blowers are generallystarted to operate at the maximum speed. However, most of the currentgarden handheld blowers need to be operated by two hands for controllingthe device and also to press a boost button. Thus, the operation of suchdevices is inconvenient and the operator may feel tired during a longtime of operation.

Additionally, it is proved by experiments that in order to blow plentyof fallen leaves on the ground or some relatively heavy garbage, ablower needs a relatively large air flow rate. As for the handheld DCblower with a battery pack mounted to the housing in the current market,the small capacity of the battery and the design limitations cause theblowing efficiency of the whole blower to be relatively low. The airflow rate of the blower is relatively small, and the working timecapacity of the battery is relatively short, and thus it cannot meet therequirements of the operator.

SUMMARY

As will become apparent from the detailed description which follows, thesubject handheld blower is designed to provide improved operatingcomfort.

In order to achieve the above objective, the subject handheld blowerincludes a housing having an air inlet and a duct assembly mounted infront of the air inlet, the duct assembly comprising a duct connectedwith the housing, a motor and a fan mounted in the duct, a batterymounted on the housing, a blowpipe connected to the housing by the ductassembly, the blowpipe defining a central axis in the length direction,and a handle arranged above the housing and the battery. The handleincludes a gripping portion arranged on opposite sides of a plane inwhich the gravity center of the blower is located, and the plane isparallel to the central axis and substantially perpendicular to aworking ground. Because the gripping portion of the handle is arrangedon opposite sides of a plane in which the gravity center of the wholeblower is located, the whole structure of the machine is compact, andthe gravity center is adjacent to the gripping portion, which reducesthe force needed by the operator for overcoming the deflection of thehandheld blower during the operation, enhances the handling comfort andreduces operator fatigue during long times of gripping operation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an exemplary handheld blower constructedaccording to the description which follows;

FIG. 2 is a front view of the handheld blower of FIG. 1 with the housingremoved;

FIG. 3 is a front view of the handheld blower of FIG. 1;

FIG. 4 is a top view of the handheld blower of FIG. 1;

FIG. 5 is a view illustrating the connection between the air intake boxand the duct assembly of the handheld blower of FIG. 1;

FIG. 6 is a view of the handle of the handheld blower of FIG. 1;

FIG. 7 is a sectional view of the duct assembly of the handheld blowerof FIG. 1;

FIG. 8 is a perspective view of the duct assembly of the handheld blowerof FIG. 1 with a portion of the duct and the connecting pipe removed;and

FIG. 9 illustrates the curve of the functional relationship between theouter diameter of the blade of the fan and the blowing efficiency of thehandheld blower of FIG. 1.

DETAILED DESCRIPTION

In order to better understand the technical content of the presentinvention, the following will describe a non-limiting description ofpreferred embodiments with reference to the drawings in detail.

Referring to FIG. 1 and FIG. 2, in one embodiment of the presentinvention, the handheld blower 10 includes a housing 11, an air intakebox 12, a handle 13, a control assembly 14, a battery 15, a ductassembly 17 and a blowpipe 19. The battery 15 and the duct assembly 17are arranged on opposite ends of the housing 11 and the handle 13 isarranged on the housing 11. The housing 11 is connected with theblowpipe 19 by the duct assembly 17, and the air intake box 12 isarranged in the housing 11.

Referring to FIGS. 2 and 3, the housing 11 includes an accommodatingchamber 110, a mounting portion 111, a main air inlet 112, a secondaryair inlet 113, a side air inlet 114 and a bending portion 115. Theaccommodating chamber 110 is formed in the housing 11, the air intakebox 12 is mounted in the accommodating chamber 110, and one end of theduct assembly 17 is fixedly mounted in the mounting portion 111. Themain air inlet 112 and the secondary air inlet 113 are arranged on thebottom of the housing 11, and the side air inlet 114 is arranged on aside wall of the housing 11. The airflow enters from the main air inlet112 or the secondary air inlet 113, and is guided by the bending portion115 to flow into the duct assembly 17 from the mounting portion 111. Theside air inlet 114 can facilitate the entrance of the airflow and obtaina good entrance effect of the airflow. It should be noted that the sideair inlet 114 may also be omitted.

Referring to FIG. 5, the air intake box 12 includes a bottom air intakeportion 120, a rear air intake portion 121, a side air intake portion122 and an air outlet 123. The bottom air intake portion 120 and therear air intake portion 121 are each configured as a grille structure,and the rear air intake portion 121 is configured as a ramp structurecorresponding to the bending portion 115 of the housing 11. The airoutlet 123 of the air intake box 12 is connected with an air intake endof the duct assembly 17. As such, the air intake box 12 and the ductassembly 17 may form an independent working unit 18, and the bottom airintake portion 120, the rear air intake portion 121 and the side airintake portion 122 of the air intake box 12 form a plurality of blowingpassages with the air outlet 123 respectively, thus as long as theindependent working unit 18 can be mounted into the housing and form theblowing passages, the machine can effect a blowing function no matterhow the housing 11 changes. In this way, the shape of the handheldblower may be changed quickly without changing the inner working units.In the illustrated embodiment, the main air inlet 112 of the housing 11,the bottom air intake portion 120 and the air outlet 123 of the airintake box 12 cooperatively define a first blowing passage, thesecondary air inlet 113 of the housing 11, the rear air intake portion121 and the air outlet 123 of the air intake box 12 cooperatively definea second blowing passage, and the side air inlet 114 of the housing 11,the side air intake portion 122 and the air outlet 123 of the air intakebox 12 cooperatively define a third blowing passage.

Referring to FIGS. 1, 2, 4 and 6, the handle 13 used to handle thehandheld blower 10 is arranged on the bending portion 115 of the housing11 and located above the housing 11 and the battery 15. The handle 13includes a gripping portion 130, a battery mounting portion 131 and aspeed adjusting portion 132, wherein the gripping portion 130 isarranged between the battery mounting portion 131 and the speedadjusting portion 132.

In the illustrated embodiment, a central axis L1 is defined on theblowpipe 19 in the length direction. The gravity centre G of the wholeblower is located in a plane P1, and the plane P1 is substantiallyperpendicular to the working ground P2 and parallel to the central axisL1. The housing 11, the battery 15, the duct assembly 17 and theblowpipe 19 are substantially arranged along the same line, and thegripping portion 130 of the handle 13 is arranged on opposite sides ofthe plane P1. Preferably, the gripping portion 130 of the handle 13 issymmetrically arranged on opposite sides of the plane P1. Thus, themachine has a compact structure, and the gravity centre is close to thegripping portion, which reduces the force needed to overcome thedeflection of the handheld blower during operation, enhances the comfortof the handling of the device and reduces operator fatigue during longtimes of gripping operation. It should be noted that the battery mayalso be arranged above or below the housing 11. The housing 11, the ductassembly 17 and the blowpipe 19 are substantially arranged along thesame line. The gripping portion 130 of the handle 13 is arranged onopposite sides of the plane in which the gravity center is located. Theplane is parallel to the axis of the blowpipe 19 and substantiallyperpendicular to the working ground P2 which is defined as a horizontalplane.

The control assembly 14 is used to control the switching-on orswitching-off and the rotating speed of the handheld blower. The controlassembly 14 includes a trigger 140 for controlling the switching-on orswitching-off of the handheld blower, a locking button 141 forpreventing a mistaken startup of the handheld blower, a boost button 142for controlling the handheld blower to rotate at the maximum rotatingspeed and a speed adjusting button 143 for adjusting the rotating speedof the motor 172 of the handheld blower. The speed adjusting button 143is arranged on the speed adjusting portion 132. For the sake ofconvenience, the trigger 140, the locking button 141 and the boostbutton 142 are all arranged on the gripping portion 130. With thisposition arrangement, the operator can press the trigger 140 whileoperating the boost button 142 by his thumb. Additionally, if themachine needs to be operated under high-speed blowing condition for along time, the operator can press the boost button 142 and the lockingbutton 141 by his palm simultaneously while handling the grippingportion 130, and can press the trigger 140 by his fingers. In this way,the handheld blower may be started by one-hand operation and continuallyoperated at the maximum rotating speed, which reduces hand fatigueduring the operation and enhances the comfort of handling the device.The locking button 141 is an assistant switch member for preventing themistaken startup of the handheld blower. It may be appreciated that thelocking button 141 may be omitted, and the operator can only use thetrigger 140 and the boost button 142 to start up the handheld blower andkeep a continuous operation.

The battery 15 is mounted to the housing 11 by the battery mountingportion 131, and used to provide power to the handheld blower. Thehousing 11 is provided with an ejecting head 116 for cooperating withthe battery 15 and a battery mounting base (not shown). The ejectinghead 116 is connected with a spring 117 and may rotate relative to thehousing. When the battery 15 is assembled to the housing 11, the frontend of the battery 15 pushes the ejecting head 116 to rotate against theelastic force of the spring 117 and deflect to a predetermined position.When the battery 15 is disassembled, the ejecting head 116 pushes thebattery 15 towards the disassembling direction under the action of thespring 117.

The battery mounting portion 131 is provided with a battery latch 1311for locking the battery 15 on the housing 11. The battery latch 1311 isfurther provided with a releasing button 1312 linked with it. Bypressing or pushing the releasing button 1312, the battery latch 1311 isdisengaged from the battery 15, and then the battery 15 may be removedconveniently under the action of the ejecting head 116. Certainly, thebattery mounting portion 131 may also be arranged on the housing 11 aslong as it can lock the battery 15 to the battery mounting base arrangedon the housing 11 when mounting the battery 15.

Referring to FIG. 7 and FIG. 8, the duct assembly 17 includes aconnecting pipe 170 connected with the blowpipe 19, a duct 171 connectedto the housing 11, a motor 172 and a fan 173. The motor 172 is connectedwith the trigger 140 of the control assembly 14 by wires, and theconnecting pipe 170 is locked with the duct 171. A supporting ring 174for accommodating the motor 172 is arranged in the connecting pipe 170and the duct 171. The motor 172 is mounted in the supporting ring 174and the fan 173 is connected with the output shaft of the motor 172. Aplurality of radial air guiding ribs 175 are integrally formed in theconnecting pipe 170 and the duct 171. One end of each air guiding rib175 is connected to the inner wall of the connecting pipe 170 or theduct 171, and the other end is connected to the supporting ring 174,wherein at least one air guiding rib 175 is provided with a channel 176for the wires of the motor 172 to pass through. This arrangement notonly increases the reliability of positioning the wires while reducingair resistance, it also eliminates the need of added members, thus thewires can be fixed easily, reliably and simply during assembly. It maybe appreciated that if the length of the duct 171 is sufficient, theconnecting pipe 170 may be omitted, and the supporting ring 174 and theair guiding ribs 175 can be directly arranged on the duct 171. The duct171 has an air intake portion 1711 which is configured as a lip edgestructure for facilitating the guidance of air in order to reduce thenoise at the air intake portion 1711 of the duct. The above lip edgestructure may be formed with the duct 171 in one piece or may be formedas a single member to be mounted to the duct 171.

In an embodiment of the present invention, the fan 173 is an axial fan,and the motor 172 is a brushless DC motor. The fan 173 is driven by themotor 172, and includes a hub 1731 mounted to the rotating shaft (notshown) of the motor and a plurality of blades 1732 mounted to the hub1731. The blades 1732 and the hub 1731 may be formed in one piece or maybe formed separately and then assembled together.

One end of the fan 173 adjacent to the housing 11 is provided with afairing 177, and the other end of the fan 173 adjacent to the blowpipe19 is connected with the motor 172. Since the fan 173 is an axial fan,after passing through the first blowing passage, the second blowingpassage, the third blowing passage and entering the fan 173, the airflowaxially passes through the air guiding ribs 175 under the action of thefan 173 and flows into the blowpipe 19. In an embodiment of the presentinvention, the supporting ring 174 includes an accommodating portion1741 for accommodating the motor 172 and an air guiding portion 1742.The front end of the accommodating portion 1741 is provided with anopening, and the air guiding portion 1742 is a tapered structureintegrally formed with the accommodating portion 1741. The air guidingportion 1742 is arranged on one end of the supporting ring 174 adjacentto the blowpipe 19 and has a plurality of air intakes for the coolingairflows to pass through. During the blowing process, since the airpressure around the motor 172 is larger than that around the fan 173, asecondary airflow is generated under the action of pressuredifferential. The secondary airflow passes through the air intakes ofthe air guiding portion 1742 and flows into the supporting ring 174 tocool the interior of the motor 172, and finally flows out from theopening on the front end of the accommodating portion 1741, thus themotor 172 may be cooled during the blowing process.

Still referring to FIG. 3, in order to facilitate the carrying of themachine, the handheld blower of the present invention further includes astrap with two ends connected to two hanging holes 118, 119 on thehousing 11 respectively. The two hanging holes 118, 119 have the samedistance from the center of the gripping portion 130, and the centerpoint of the connecting line between the positions of the two hangingholes 118, 119 is located around the gravity center line of the wholemachine.

The handheld DC blower is mainly used to blow fallen leaves and smallgarbage on the ground. It is proved by research that, in order to blowplenty of fallen leaves on the ground or some garbage, the air flow rateof the handheld blower generally needs to be larger than 395 cfm. Thehandheld DC blower in the current market with a battery pack mounted onthe housing has a small battery capacity and a relatively low blowingefficiency, and thus cannot meet the requirement that the air flow rateis larger than 395 cfm and the working time is more than 5 min. Thus, inorder to obtain relatively large air flow rate and relatively highblowing efficiency, it is required to optimize the battery capacity, thebrushless DC motor, the parameters of the axial fan and the air passagedesign.

In order to obtain the desired air flow rate and working time, thecapacity of the battery is generally larger than 170 wh. Generally, thecapacity of the battery is proportional to the weight itself. As for thehandheld blower, due to the requirement for the weight of the wholemachine, the capacity of the battery pack is preferably in the rangefrom 170 wh to 400 wh. On one hand, if the capacity of the battery packis too small, the machine cannot meet the requirement for the air flowrate and the working time; on the other hand, if the capacity of thebattery pack is too large, the tiredness during the operation may beincreased, which is not convenient for a long time operation.

Table 1 lists the effective working time of the handheld blower operatedat the maximum air flow rate and the minimum air flow rate when thecapacity of the battery is 200 wh and 300 wh. It can be seen from table1 that if the capacity of the battery is constant, the air flow rate isinversely proportional to the working time, that is to say, the largerthe air flow rate is, the shorter the working time will be. Inaccordance with the human engineering, through a number of simulationexperiment analysis for the weight of the whole machine and the bearingdegree of people, it can be determined that the performance parametersof the handheld blower suitable for most operators are as follows: theair flow rate is in the range from 385 cfm to 700 cfm and the workingtime is in the range from 20 min to 75 min.

TABLE 1 Capacity of the battery Maximum air flow rate Minimum air flowrate 200 wh 36 min 120 min 300 wh 54 min 180 min

If the capacity of the battery is constant, in order to obtain ahandheld DC handheld blower with an air flow rate larger than 395 cfmand higher blowing efficiency, it is required to optimize the brushlessDC motor, the parameters of the axial fan and the air passage design.

Referring to FIGS. 7 and 8 again, the motor 172 is accommodated into thesupporting ring 174 arranged in the duct 171 and the connecting pipe170, and the hub 1731 of the axial fan 173 is mounted to the rotatingshaft of the motor 172. In accordance with the principle ofaerodynamics, in order to reduce the air resistance and increase the airspeed, the contours of the fairing 177, the hub 1731 and the supportingring 174 are designed using a streamlined shape, thus the diameter ofthe motor 172 may define the diameter of the hub 1731. In addition, whendesigning the axial fan, the ratio of the root diameter to the topdiameter of the blade, i.e., the ratio of the diameter of the hub of thefan to the outer diameter of the blade, hereinafter referred to as hubratio, is an important parameter. With the same outer diameter of theblade and the hub, the smaller hub and the longer blades are moresuitable for the axial flow blower having low pressure and high flowrate. It is proved by simulation analysis that the blowing efficiency ofthe blades is relatively high when the hub ratio is in the range from0.25 to 0.45. Thus, if the diameter of the motor is relatively large,the diameter of the hub would be relatively large accordingly. In orderto set the parameter of the hub ratio in the optimal scope so as toobtain a higher blowing efficiency, the diameter of the blade would beincreased accordingly, and thus the volume of the duct is increased andthe volume of the whole machine is increased. As a result, both theshape design and the operating comfort during the actual operation willbe affected adversely. Thus, the diameter of the motor is preferably nolarger than 35 mm. In this way, the whole machine is light in weight andoccupies a smaller space. In accordance with the scope of the hub ratio,it can be further concluded that the scope of the outer diameter of theblade is in the range from 78 mm to 140 mm, thus the blowing efficiencyis higher.

As shown in FIG. 9, C1 and C2 are curves illustrating the functionalrelationship between the outer diameter of the blade and the blowingefficiency, which is obtained by simulation modeling and analysis whenthe air flow rate is 560 cfm and 500 cfm respectively. It can be seenfrom FIG. 9 that the best blowing efficiency is obtained when the outerdiameter of the blade is in the range from 85 mm to 140 mm. The blowingefficiency herein is defined as the ratio of the work caused by the flowof the airflow to the work consumed by the rotation of the blades of thefan.

Further, as the diameter of the motor is smaller than 35 mm and theratio of the air flow rate to the diameter of the motor is larger than12 cfm/mm, the handheld blower of the present invention can obtainhigher blowing efficiency with a small motor as compared with the commonhandheld blower.

The following will describe the air passage design of the presentinvention in detail. Referring to FIG. 2 again, along the direction ofthe axis L1, the flow cross-section S1 of the air passage at the rearend of the fan 173 adjacent to the air inlet 112 is larger than the flowcross-section S3 at the air outlet 191 of the blowpipe 19, and acircular flow-through area is formed between the inner wall of the duct171 and the hub 1731 of the fan. The ratio of the area of the flowcross-section S3 of the air outlet 191 of the blowpipe 19 relative tothe area of the flow cross-section S2 of the circular flow-through areaat the position of the axial fan 173 is preferably greater than or equalto 0.8. This arrangement can effectively improve the flow characteristicof the airflow, and enhance the blowing efficiency. Meanwhile, the airpassage between the fan 173 and the air outlet 191 defines an outercontour line L2 having an angle relative to the axis L1. Preferably, theangle between the axis L1 and the outer contour line L2 is smaller than8°. That is because a large angle can cause a certain air resistanceagainst the airflow, so that the loss of the airflow in the wall of theair passage is increased and the loss of the high-speed airflow in theblowpipe 19 is also increased, which causes the reduction of the blowingefficiency of the whole machine. With the optimization for the above twoparameters, a desired flow of airflow may be obtained, while a relativesmall pressure loss is obtained in the blowpipe 19, which caneffectively improve the blowing efficiency.

In order to obtain a sufficient air flow rate at the air outlet 191,after being calculated by CFD (Computational Fluid Dynamics) and testdata, it is common to design a relatively large area of the air outlet.Preferably, the area of the cross-section of the air outlet 191 isconfigured to be larger than 4300 mm². Certainly, the air speed willreduce as the blowing area increases, thus the area of the air outlet ispreferably in the range from 4300 mm² to 8000 mm² according to theactual operation.

By optimizing the capacity of the battery, the brushless DC motor andthe parameters used in the design of the axial fan and improving the airpassage design, when the capacity of the battery is in the range from170 wh to 400 wh, the air flow rate of the handheld blower may be largerthan 395 cfm, and the working time may be larger than 5 min, especiallywhen the air flow rate is in the range from 430 cfm to 700 cfm.Meanwhile, it is also ensured that the ratio of the air flow rate to theinput power is larger than or equal to 0.7 cfm/w when the blower isoperated at the maximum air flow rate, thus the blowing efficiency canbe improved significantly.

Although the above embodiments have disclosed the present invention,they are not intended to limit the invention. Various changes andmodifications will occur to a person skilled in the art withoutdeparting the spirit and scope of the present invention. Thus, theprotection scope of the invention shall be determined by the attachedclaims.

What is claimed is:
 1. A blower, comprising: a housing having an airinlet; a duct assembly mounted to the housing in front of the air inlet,the duct assembly comprising a duct connected with the housing; a motorhaving at least a wire for use in providing electrical energy thereto; afan configured to be driven by the motor; and a blowpipe extending fromthe front of the duct assembly; wherein the duct comprises a supportingring for accommodating the motor, a plurality of radial air guiding ribsconfigured to extend from the supporting ring to the duct, and a wirechannel located adjacent to at least one of the air guiding ribs andconfigured for the wire to extend therethrough.
 2. The blower accordingto claim 1, wherein at least one of the air guiding ribs defines thewire channel extending through the air guiding rib and the wire isreceived in the wire channel in the elongation direction of the wirechannel.
 3. The blower according to claim 1, wherein the duct assemblyfurther comprises a connecting pipe connected with the blowpipe, theconnecting pipe is locked with the duct, and the supporting ring isarranged in the connecting pipe and the duct.
 4. The blower according toclaim 3, wherein one end of each air guiding rib is connected to theinner wall of the connecting pipe or the duct and the other end isconnected to the supporting ring.
 5. The blower according to claim 1,wherein the duct has an air intake portion which is configured as a lipedge for facilitating the guidance of air and the lip edge structure isformed with the duct in one piece or formed as a single member to bemounted to the duct.
 6. The blower according to claim 1, wherein thesupporting ring comprises an accommodating portion for accommodating themotor and an air guiding portion, the air guiding portion is asubstantially tapered structure that is formed with the accommodatingportion as one piece, the air guiding portion is arranged on one end ofthe supporting ring adjacent to the blowpipe, a front end of theaccommodating portion defines at least an opening, and the air guidingportion defines at least an air intake.
 7. The blower according to claim1, wherein the fan is configured to be rotatably driven about arotational axis by the motor mounted in the duct, the fan comprises ahub mounted to a rotating shaft of the motor and a plurality of bladesmounted to the hub, and a fairing is provided on one end of the fanadjacent to the housing with the motor being connected with the otherend of the fan adjacent to the blowpipe.
 8. The blower according toclaim 1, wherein the housing has an accommodating chamber and a bendingportion for turning airflow, a handle is arranged on the bending portionof the housing, and the handle comprises a gripping portion and abattery mounting portion on which a battery mounting assembly isprovided for releasably installing a battery.
 9. The blower according toclaim 8, wherein the battery has a capacity in the range from 170 wh to400 wh.
 10. The blower according to claim 1, wherein the fan is an axialfan having an outer diameter in the range from 85 mm to 140 mm.
 11. Theblower according to claim 1, wherein the motor is a brushless DC motorhaving a diameter less than or equal to 35 mm and the ratio of the airflow rate of the handheld blower to the diameter of the brushless DCmotor is larger than 12 cfm/mm.
 12. The blower according to claim 1,wherein the air inlet comprises a main air inlet, a secondary air inlet,and a side air inlet, the main air inlet and the secondary air inlet arearranged on the bottom of the housing, and the side air inlet isarranged on the side wall of the housing.
 13. The blower according toclaim 1, wherein the blower further comprises a control assembly havinga boost button for controlling the blower to rotate at the maximumrotating speed, a speed adjusting button for adjusting the rotatingspeed of the blower, and a trigger for controlling theswitching-on/switching-off of the blower with the boost button, thespeed adjusting button and the trigger being arranged on the grippingportion respectively.
 14. The blower according to claim 13, wherein thehandle comprises a speed adjusting portion arranged adjacent to thegripping portion and the speed adjusting button is arranged on the speedadjusting portion.
 15. A blower, comprising: a housing having an airinlet; a duct connected with the housing; a motor having at least a wirefor use in providing electrical energy thereto; a fan configured to bedriven by the motor; and a blowpipe extending from the front of theduct; wherein the duct comprises a supporting ring for accommodating themotor and a wire channel configured to extending from the supportingring towards the duct for the wire of the motor to pass therethrough.16. The blower according to claim 15, wherein the fan is configured tobe rotatably driven about a rotational axis by the motor mounted in theduct.
 17. The blower according to claim 15, wherein a plurality ofradial air guiding ribs are arranged between the duct and the supportingring, the air guiding ribs are partially extended between the duct andthe supporting ring, and each of the air guiding ribs has one endconnected to the inner wall of the duct and the other end connected tothe supporting ring.
 18. The blower according to claim 17, wherein atleast one of the air guiding ribs defines the wire channel extendingthrough the air guiding rib and the wire is received in the wire channelin the elongation direction of the wire channel.
 19. The bloweraccording to claim 15, wherein the supporting ring comprises anaccommodating portion for accommodating the motor and an air guidingportion, the air guiding portion is a substantially tapered structureand formed with the accommodating portion in one piece, the air guidingportion is arranged on one end of the supporting ring adjacent to theblowpipe, a front end of the accommodating portion defines at least anopening, and the air guiding portion defines at least an air intake. 20.The blower according to claim 15, wherein the air inlet comprises a mainair inlet, a secondary air inlet and a side air inlet, the main airinlet and the secondary air inlet are arranged on the bottom of thehousing, and the side air inlet is arranged on the side wall of thehousing.